Power assembly of speed reducer side outgoing line, power assembly integrated with double motors and electric vehicle

Abstract

The invention provides a speed reducer side outgoing line power assembly, a dual-motor integrated power assembly and an electric vehicle, the power assembly comprises a middle integrated shell, a rotary transformer sensor, motors and a speed reducer, the middle integrated shell comprises a partition plate and two circumferential shell bodies, the partition plate divides inner cavities of the two circumferential shell bodies in the axial direction, and the rotary transformer sensor is arranged in the middle integrated shell body; an inner cavity of one circumferential shell is used for containing a rotary transformer stator of a rotary transformer sensor and a motor stator, and an inner cavity of the other circumferential shell is used for containing a gear set of a speed reducer. The partition plate comprises a shaft hole and a first wire outlet hole, the shaft hole and the first wire outlet hole are communicated with inner cavities of the two circumferential shells, and the shaft hole is used for containing at least one of the coupling end of an input shaft of the speed reducer or the coupling end of a motor shaft. At least one of the two axial end faces of the partition plate is used for fixing the rotary transformer stator and the outer ring of the bearing. The other circumferential shell comprises a first through hole, and the first through hole is communicated with an inner cavity of the other circumferential shell and an inner cavity of the motor controller. The power assembly provided by the invention has a relatively small axial size.

Description

[0001] This application is a divisional application. The original application has the application number 202311638750.7 and the original application date is November 30, 2023. The entire contents of the original application are incorporated herein by reference. Technical Field

[0002] This application relates to the field of powertrain technology, and in particular to a powertrain with a reducer-side cable outlet, a powertrain integrating dual motors, and an electric vehicle. Background Technology

[0003] In recent years, environmental pollution and energy shortages have accelerated the development and utilization of green and renewable energy. Electric vehicles, with their advantages of low pollution, low noise, and high energy efficiency, are becoming increasingly popular with users, and their market share is increasing year by year. To accelerate development and reduce development costs, the powertrain of electric vehicles often needs to have better layout compatibility to adapt to the space requirements of front and rear axle arrangements. However, in existing electric vehicles, the structural dimensions of the powertrain are often too large, leading to difficulties in overall vehicle layout and making it difficult for the powertrain to be adapted to different vehicle models. Summary of the Invention

[0004] This application provides a powertrain with a reducer-side cable outlet, a powertrain integrating dual motors, and an electric vehicle.

[0005] In a first aspect, this application provides a powertrain with a reducer-side output cable. The powertrain includes an intermediate integrated housing, a resolver sensor, a motor, and a reducer. The motor is driven by a motor controller to drive the reducer. The intermediate integrated housing includes an integrally die-cast partition and two circumferential housings. The two circumferential housings are arranged axially along the powertrain. One circumferential housing is used to fix the stator of the motor and accommodate the rotor of the motor. The other circumferential housing is used to accommodate the gear set of the reducer. The other circumferential housing includes at least one through hole penetrating the other circumferential housing. The partition is used to separate the inner cavities of the two circumferential housings. The partition includes a shaft hole, at least one cable outlet hole, and two opposite end faces along the axial direction of the powertrain. The shaft hole and the at least one cable outlet hole are used to connect the inner cavities of the two circumferential housings. The shaft hole is coaxially arranged with the input shaft of the reducer or the motor shaft of the motor. The distance between the at least one cable outlet hole and the center point of the shaft hole is greater than the inner diameter of the resolver stator of the resolver sensor.

[0006] At least one outlet hole is provided to accommodate the connecting wires of the various components within the circumferential housing. In this embodiment, a partition includes at least one outlet hole connecting the inner cavity of the first circumferential housing and the inner cavity of the second circumferential housing, and the second circumferential housing includes at least one through hole connecting the inner cavity of the second circumferential housing and the inner cavity of the motor controller, so that the connecting wires of the components within the first circumferential housing can be connected to the motor controller from the inner cavity of the first circumferential housing, sequentially through the outlet hole, the inner cavity of the second circumferential housing, and the through hole. On the one hand, the components within the first circumferential housing are connected to the motor controller from the second circumferential housing on the reducer side, making full use of the radial space between the second circumferential housing and the gear set of the reducer. The connecting wires of the components within the first circumferential housing do not need to occupy additional axial space of the first circumferential housing, or the axial space occupied by the components within the first circumferential housing is reduced. The components in the intermediate integrated housing are arranged compactly, reducing the axial dimension of the powertrain, which is beneficial for the installation and arrangement of the powertrain in electric vehicles.

[0007] On the other hand, since the connecting wires of the devices in one circumferential housing pass through the wire outlet holes of the partition and are connected to the motor controller in the other circumferential housing, the connecting wires are concentrated in the middle of the intermediate integrated housing near the middle of the partition, which reduces the risk of the connecting wires being bumped or scratched, and improves the reliability of the connection between the connecting wires and the devices and motor controller in the one circumferential housing.

[0008] In one embodiment, one of the two end faces facing the stator of the motor is used to fix the resolver stator of the resolver sensor. The resolver rotor of the resolver sensor is used to drive the motor shaft of the motor or the input shaft of the reducer. The at least one outlet hole includes a first outlet hole for passing through a resolver connection cable between the resolver sensor and the motor controller. The resolver sensor receives electrical energy transmitted from the motor controller through the resolver connection cable. The resolver connection cable can enter the inner cavity of the other circumferential housing through the first outlet hole and connect to the motor controller through a through hole in the other circumferential housing.

[0009] In this embodiment, the resolver sensor connects to the motor controller from the other circumferential housing on the reducer side. This fully utilizes the radial space between the other circumferential housing and the gear set of the reducer. The resolver sensor's connecting cable does not require additional axial space in the first circumferential housing, or the axial space occupied by the connecting cable is reduced. The components in the intermediate integrated housing are arranged compactly, reducing the axial size of the powertrain and facilitating its installation in electric vehicles. Furthermore, since the resolver sensor's connecting cable passes through the first outlet hole of the partition and connects to the motor controller within the other circumferential housing, the connecting cable is concentrated in the middle of the intermediate integrated housing near the partition. This reduces the risk of the connecting cable being bumped or scratched, improving the reliability of the connection between the resolver connecting cable and the resolver sensor and motor controller.

[0010] In one embodiment, the distance between the first cable outlet and the shaft hole along the radial direction of the powertrain is less than the inner diameter of the motor stator of the motor, and the area of ​​the first cable outlet is less than the area of ​​the shaft hole. In this embodiment, the first cable outlet is positioned closer to the shaft hole along the radial direction, making the first cable outlet closer to the resolver stator, thereby shortening the length of the resolver connection line between the first cable outlet and the resolver stator, which helps to miniaturize the powertrain and streamline the wiring. In addition, the smaller area of ​​the first cable outlet compared to the shaft hole reduces the opening area of ​​the partition and improves the overall strength of the partition.

[0011] In one embodiment, the lead-out end of the motor winding of the motor faces the end face, and the at least one lead-out hole includes a second lead-out hole for passing through the motor winding of the motor and the winding connection wire of the motor controller. The second lead-out hole is used to accommodate the passage of the winding connection wire of the motor winding. The motor winding receives electrical energy transmitted by the motor controller through the winding connection wire. The winding connection wire can enter the inner cavity of the other circumferential housing through the second lead-out hole and connect to the motor controller through the through hole of the other circumferential housing.

[0012] In this embodiment, both the motor winding and the resolver sensor are connected to the motor controller from the other circumferential housing on the reducer side. On the one hand, this makes full use of the radial space between the other circumferential housing and the gear set of the reducer. The winding connection line and the resolver connection line do not need to occupy the axial space of the first circumferential housing, or the axial space occupied by the winding connection line and the resolver connection line is reduced. The components in the intermediate integrated housing are arranged compactly, reducing the axial size of the powertrain, which is beneficial for the installation and arrangement of the powertrain in electric vehicles.

[0013] On the other hand, the winding connection wires are concentrated in the middle of the intermediate integrated housing near the partition, which reduces the risk of the winding connection wires being bumped or scratched, and improves the reliability of the connection between the winding connection wires and the motor windings and the motor controller.

[0014] On the other hand, the second outlet hole is arranged alternately with the first outlet hole and the shaft hole. The second outlet hole is different from the first outlet hole and the shaft hole. The winding connecting wire and the resolver connecting wire pass through different outlet holes, which helps to improve the regularity of the circuit layout and reduce the risk of circuit misconnection.

[0015] In one embodiment, the distance between the center point of the at least one outlet hole and the center point of the shaft hole along the radial direction of the powertrain is less than the outer diameter of the motor stator of the motor. Generally, the distance between the outlet end of the motor winding and the center point of the shaft hole is less than the outer diameter of the motor stator of the motor, and the outer diameter of the resolver stator is less than the outer diameter of the motor stator of the motor. In this embodiment, arranging at least one outlet hole along the radial direction of the powertrain between the shaft hole and the outer peripheral surface of the motor stator reduces the length of the winding connecting lines and resolver connecting lines within the circumferential housing, which helps to miniaturize the powertrain and optimize wiring. On the other hand, since the axial projection of at least one outlet hole is located within the projection of the outer peripheral surface of the motor stator, the winding connecting lines and resolver connecting lines do not additionally occupy the radial space of the circumferential housing, which helps to reduce the radial dimension of the circumferential housing, thereby reducing the overall size of the powertrain.

[0016] In one embodiment, the at least one cable outlet includes a first cable outlet and a second cable outlet. The second cable outlet and the first cable outlet are spaced apart along the circumference of the powertrain. The distance between the second cable outlet and the shaft hole along the radial direction of the powertrain is greater than or equal to the distance between the first cable outlet and the shaft hole. In this embodiment, since the second cable outlet and the first cable outlet are arranged radially between the input shaft bearing cavity and the inner wall of the circumferential housing, and the space between the input shaft bearing cavity and the inner wall of the circumferential housing is limited, the circumferential arrangement of the second cable outlet and the first cable outlet reduces interference between winding connection lines. Furthermore, it improves the overall strength of the partition, making the structure of the second cable outlet and the first cable outlet less prone to damage.

[0017] In one embodiment, the area of ​​the second outlet hole is greater than or equal to the area of ​​the first outlet hole. In this embodiment, the area of ​​the second outlet hole is larger than that of the first outlet hole to facilitate the smooth passage of larger winding connecting wires through the second outlet hole.

[0018] In one embodiment, the at least one through-hole includes a first through-hole and a second through-hole, which are spaced apart along the circumferential and axial directions of the powertrain. In this embodiment, the second through-hole is spaced apart from the first through-hole. The second through-hole is different from the first through-hole, and the winding connection wire and the resolver connection wire are connected to the motor controller through different through-holes. The smaller diameters of the second and first through-holes facilitate the sealing between the other circumferential housing and the motor controller.

[0019] In one embodiment, the distance between the second through hole and the partition plate along the powertrain axial direction is less than the distance between the first through hole and the partition plate. In this embodiment, the second through hole and the first through hole are axially offset, reducing the space occupied by the second and first through holes in the radial direction of the other circumferential housing. This helps to reduce the size of the powertrain. Furthermore, generally, the motor windings are connected to high-voltage circuits, and the resolver sensor is connected to low-voltage circuits. The winding connection wires are relatively large, and they are typically made of copper. The second through hole is closer to the partition plate, facilitating the fixing of the winding connection wires and reducing the risk of interference between the winding connection wires and the gear set of the reducer.

[0020] In one embodiment, the distance between the second through hole and the shaft hole along the radial direction of the powertrain is greater than or equal to the distance between the first through hole and the shaft hole. In this embodiment, since the winding connection wire is relatively large and there are generally many second through holes, the second through holes are set far away from the shaft hole, which facilitates the arrangement of the resolver connection wire between the first through hole and the first outlet hole, and also facilitates the resolver connection wire to connect to the motor controller through the first through hole.

[0021] In one embodiment, the other end face opposite to the motor stator includes an input shaft bearing cavity, an intermediate shaft bearing cavity, and an output shaft bearing cavity. The input shaft bearing cavity is used to fix the outer ring of the input shaft bearing, and the inner ring of the input shaft bearing is used for drive connection to the input shaft of the reducer. The shaft hole and the input shaft bearing cavity are coaxially arranged. The intermediate shaft bearing cavity is used to fix the outer ring of the intermediate shaft bearing, and the inner ring of the intermediate shaft bearing is used for drive connection to the intermediate shaft of the reducer. The output shaft bearing cavity is used to fix the outer ring of the output shaft bearing, and the inner ring of the output shaft bearing is used for drive connection to the output shaft of the reducer. The distance between the output shaft bearing cavity and the shaft hole is greater than the distance between the intermediate shaft bearing cavity and the shaft hole, and the distance between the at least one outlet hole and the input shaft bearing cavity is less than the distance between the at least one outlet hole and the output shaft bearing cavity.

[0022] In this embodiment, the resolver sensor and the input shaft bearing cavity are respectively located on opposite end faces, which helps to organize the arrangement of the powertrain components and facilitates powertrain maintenance. Furthermore, at least one cable outlet, such as the first and second cable outlets, is arranged on the periphery of the input shaft bearing cavity away from the output shaft bearing cavity. This helps to organize the arrangement of the resolver connecting wires and winding connecting wires within the other circumferential housing, reducing the risk of interference between the resolver connecting wires / winding connecting wires and the reducer gear set.

[0023] In one embodiment, the powertrain includes another motor, another reducer, another intermediate integrated housing, a partition plate, and two end plates. The partition plate is used to fixably connect the other circumferential housing of the first intermediate integrated housing to form a reducer receiving cavity, the reducer receiving cavity accommodating the first reducer. The partition plate is also used to fixably connect the other circumferential housing of the second intermediate integrated housing to form another reducer receiving cavity, the second reducer receiving cavity accommodating the second reducer. One end plate is used to fixably connect the other circumferential housing of the first intermediate integrated housing to form a motor receiving cavity, the motor receiving cavity accommodating the first motor. The other end plate is used to fixably connect the other circumferential housing of the second intermediate integrated housing to form another motor receiving cavity, the second motor receiving cavity accommodating the second motor.

[0024] In this embodiment, the powertrain integrates two motors and two reducers, which can increase the integration of the powertrain, reduce its size and cost, facilitate the lightweight design of the powertrain, and improve power density.

[0025] In one embodiment, the powertrain includes another resolver sensor, and the end face of the other intermediate integrated housing partition facing the other motor stator is used to fix the other resolver sensor. Along the axial direction of the powertrain, the distance between the one resolver sensor and the other resolver sensor is greater than the distance between the one intermediate integrated housing partition and the other intermediate integrated housing partition, and less than the distance between the motor stator of the one motor and the motor stator of the other motor.

[0026] In this embodiment, two resolver sensors are arranged along the powertrain axis inside the two motor stators and outside the two partitions. Both resolver sensors have their wiring exiting from the inside of the two partitions, i.e., the reducer side. The resolver connection wires of the two resolver sensors are connected to the motor controller through the inner cavities of the other circumferential housing, which helps to reduce the axial length of the powertrain and improve its adaptability. Furthermore, since the resolver connection wires of the two resolver sensors are arranged inside the two motor stators, the risk of impact or scratches to the resolver connection wires is reduced, improving the reliability of the connection between the resolver connection wires and the resolver sensors and motor controller.

[0027] Secondly, this application provides an integrated dual-motor powertrain, comprising two motors, two reducers, two resolver sensors, two intermediate integrated housings, and a partition plate. Each intermediate integrated housing includes an integrally die-cast partition plate and two circumferential housings. The two circumferential housings of each intermediate integrated housing are arranged axially along the powertrain. One circumferential housing is used to fix the stator of one motor and accommodate the rotor of one motor, while the other circumferential housing is used to accommodate the gear set of one reducer. The partition plate includes two mounting surfaces axially along the powertrain, each mounting surface being used to fixably connect the other circumferential housing of one intermediate integrated housing. The other circumferential housing of each intermediate integrated housing includes at least one through hole penetrating the other circumferential housing. The partition plate of each intermediate integrated housing includes a shaft hole, at least one cable outlet hole, and two opposite end faces axially along the powertrain. The shaft hole and the at least one cable outlet hole are used to connect the inner cavities of the two circumferential housings within the same intermediate integrated housing. Each of the said shaft holes is coaxially arranged with the input shaft of one of the reducers or the motor shaft of one of the motors, and the distance between the center point of the at least one outlet hole and the center point of the shaft hole is greater than the inner diameter of the resolver stator of the resolver sensor.

[0028] In this embodiment, the powertrain integrates two motors and two reducers, which can increase the integration of the powertrain, reduce its size and cost, facilitate the lightweight design of the powertrain, and improve power density.

[0029] In this embodiment, the components within each of the circumferential housings are connected to the motor controller from the other circumferential housing on the reducer side. This fully utilizes the radial space between the other circumferential housing and the gear set of the reducer. The connection lines of the components within each of the circumferential housings do not require additional axial space in the circumferential housing, or the axial space occupied by the components within each of the circumferential housings is reduced. The components in each intermediate integrated housing are arranged compactly, reducing the axial dimension of the powertrain, which is beneficial for the installation and arrangement of the powertrain in electric vehicles.

[0030] On the other hand, since the connecting wires of the devices in each of the circumferential housings pass through the outlet holes of the partition and are connected to the motor controller in the other circumferential housing, the connecting wires are concentrated in the middle of the powertrain along the axial direction, which reduces the risk of the connecting wires being bumped or scratched, and improves the reliability of the connection between the connecting wires and the devices and motor controller in the circumferential housing.

[0031] In one embodiment, the powertrain further includes a motor controller housing. The motor controller housing includes a control signal connector mounting hole and a high-voltage DC connector mounting hole. The control signal connector mounting hole is used to fix a control signal connector, which transmits control signals to the motor controller. The high-voltage DC connector mounting hole is used to fix a high-voltage DC connector, which receives power from the power battery. The control signal connector mounting hole and the high-voltage DC connector mounting hole are arranged opposite each other along an axis perpendicular to the powertrain. Along the direction in which the control signal connector mounting hole and the high-voltage DC connector mounting hole are arranged opposite each other, the control signal connector mounting hole and the high-voltage DC connector mounting hole respectively penetrate the motor controller housing.

[0032] In one embodiment, the at least one through hole in the other circumferential housing of each intermediate integrated housing serves to connect the inner cavity of the motor controller housing and the inner cavity of the other circumferential housing. Along the axial direction of the powertrain, the at least one through hole in one of the intermediate integrated housings and the at least one through hole in the other circumferential housing are respectively arranged on both sides of the partition plate.

[0033] In this embodiment, in each intermediate integrated housing, at least one through hole is located closer to the partition, which helps to reduce the length of the resolver connection line and the winding connection line, and improves the regularity of the wiring layout in the powertrain.

[0034] In one embodiment, the powertrain includes two end plates, and the motor controller housing includes two side surfaces arranged opposite each other along the axial direction of the powertrain. The two end plates are also arranged opposite each other along the axial direction of the powertrain, and the distance between the two side surfaces along the axial direction of the powertrain is less than the distance between the two end plates. One end plate is used to fixably connect to a circumferential housing of a certain intermediate integrated housing to form a motor receiving cavity, which is used to receive one motor. The other end plate is used to fixably connect to a circumferential housing of another intermediate integrated housing to form another motor receiving cavity, which is used to receive another motor.

[0035] In this embodiment, the rearrangement of winding connection lines, resolver connection lines, resolver sensors, etc., makes the arrangement of components in the powertrain more compact and orderly. The distance between the two sides along the axial direction is less than the distance between the two end plates 34, which allows for a reduction in the housing size of the motor controller, thus facilitating the miniaturization of the powertrain.

[0036] Thirdly, this application provides an electric vehicle, which includes wheels, a battery pack, and a powertrain as described above, wherein the powertrain is used to receive power from the power battery and drive the wheels. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0038] Figure 1 This is a schematic diagram of an electric vehicle provided in one embodiment of this application.

[0039] Figure 2 This is a schematic diagram of a powertrain provided in an embodiment of this application.

[0040] Figure 3 A perspective view of a powertrain provided in an embodiment of this application.

[0041] Figure 4 A cross-sectional view of the powertrain provided in an embodiment of this application.

[0042] Figure 5 A perspective view of an intermediate integrated housing provided in an embodiment of this application.

[0043] Figure 6 A side view of an intermediate integrated housing provided in an embodiment of this application.

[0044] Figure 7 A perspective view of an intermediate integrated housing provided in an embodiment of this application.

[0045] Figure 8 This is a schematic diagram of the routing of the resolver connection line and the winding connection line provided in an embodiment of this application.

[0046] Figure 9 Rear view of an intermediate integrated housing provided in an embodiment of this application.

[0047] Figure 10 A top view of an intermediate integrated housing provided in an embodiment of this application. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0049] In this document, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0050] Furthermore, in this article, directional terms such as "upper" and "lower" are defined relative to the orientation of the structure as shown in the attached drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the structure.

[0051] For ease of understanding, the English abbreviations and related technical terms used in the embodiments of this application will be explained and described below.

[0052] Parallelism: The parallelism defined in the embodiments of this application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism, allowing for situations where the parallelism is not absolute due to factors such as assembly tolerance, design tolerance, and structural flatness.

[0053] Perpendicularity: The perpendicularity defined in the embodiments of this application is not limited to an absolute perpendicular intersection (with an included angle of 90 degrees). It is permissible for non-absolute perpendicular intersections caused by factors such as assembly tolerances, design tolerances, and structural flatness. It is permissible for errors within a small angular range, such as an assembly error range of 80 to 100 degrees, which can all be understood as a perpendicular relationship.

[0054] Please see Figure 1 , Figure 1This is a schematic diagram of an electric vehicle 1 provided in an embodiment of this application. The electric vehicle 1 includes a vehicle body 3 and a powertrain 2. The powertrain 2 is mounted on the vehicle body 3 and is capable of driving the wheels 4 to rotate to provide power to the electric vehicle 1.

[0055] The electric vehicle 1 includes two-wheeled, three-wheeled, or four-wheeled vehicles. Electric vehicle 1 can be one of the following: Pure Electric Vehicle / Battery Electric Vehicle (PEV / BEV), Hybrid Electric Vehicle (HEV), Range Extended Electric Vehicle (REEV), Plug-in Hybrid Electric Vehicle (PHEV), or New Energy Vehicle. In one embodiment, electric vehicle 1 is a means of transportation. For example, electric vehicle 1 is one of a commercial vehicle, passenger car, motorcycle, flying car, or train. In one embodiment, electric vehicle 1 is an industrial vehicle or engineering vehicle. For example, electric vehicle 1 is one of a forklift, trailer, tractor, excavator, bulldozer, or crane. In one embodiment, the vehicle can be an electric car or a gasoline-powered vehicle. In one embodiment, electric vehicle 1 can also be agricultural equipment (such as lawnmowers, harvesters, etc.), amusement equipment, toy vehicles, etc.

[0056] In one embodiment, the electric vehicle 1 may include one or more powertrains 2.

[0057] Please see Figure 2 , Figure 2 This is a schematic diagram of a powertrain 2 provided in one embodiment of this application. The powertrain 2 includes a reducer 20 and a motor 10. The motor 10 includes a motor shaft 11. The coupling end of the motor shaft 11 is drive-connected to the coupling end of the input shaft of the reducer 20, and the motor shaft 11 is used to transmit power to the input shaft of the reducer 20. The axial direction of the input shaft of the reducer 20 is parallel to the axial direction of the motor 10. The gear set of the reducer 20 can change the transmission ratio between the motor 10 and the wheel 4. The reducer 20 may include a single-speed reduction gear set, a two-speed or multi-speed reduction gear set.

[0058] In one embodiment, the powertrain 2 further includes wheel drive half-shafts 5 and a differential 6 (e.g., Figure 2(As shown). The wheel drive half-shaft 5 is fixedly connected to the wheel 4. The reducer 20 receives the power transmitted from the motor shaft 11 through the reducer's input shaft and transmits the power to the wheel drive half-shaft 5 through the differential 6 to drive the wheel 4 to rotate. The differential 6 enables the left and right (or front and rear) wheels to rotate at different speeds.

[0059] In one embodiment, the powertrain 2 may also exclude the differential 6. For example, the powertrain 2 includes two motors 10, and the torque of the two wheels 4 on both sides can be independently controlled by the two motors 10, in which case the powertrain 2 does not need to be equipped with a differential 6.

[0060] In one embodiment, the powertrain 2 may include a motor 10 or a reducer 20; for example, the powertrain 2 may be a three-in-one single-motor assembly. In another embodiment, the powertrain 2 may include multiple motors 10 or multiple reducers 20; for example, the powertrain 2 may be a distributed dual-motor assembly.

[0061] In one embodiment, the motor 10 includes a motor shaft 11, a motor rotor 12, a motor stator 13, and a motor winding 14 (see reference 1). Figure 4 The motor rotor 12 is sleeved and fixed to the outer surface of the motor shaft 11. The motor stator 13 is sleeved on the motor rotor 12 and spaced apart from the outer surface of the motor rotor 12. The motor winding 14 is installed and fixed to the motor stator 13.

[0062] In one embodiment, the electric vehicle 1 further includes a battery pack 7 (such as...). Figure 1 As shown), the powertrain 2 also includes a motor controller 31 (refer to reference). Figure 3 The motor controller 31 connects the battery pack and the motor windings of the motor 10. The motor controller 31 receives the direct current (DC) output from the battery pack 7 and converts it into alternating current (AC) before transmitting it to the motor windings. The rotating magnetic field generated by the motor windings 14 after receiving the AC power interacts with the permanent magnets on the motor rotor 12. This electromagnetic field causes the motor rotor 12 to rotate, thereby driving the motor shaft 11 to rotate.

[0063] The structural dimensions of the powertrain 2 affect its installation in the electric vehicle 1. In the prior art, the powertrain 2 has a large structural size, which makes the overall vehicle layout difficult, and the powertrain 2 is difficult to adapt to different vehicle models. The compact integrated design of the powertrain 2 provided in this application embodiment has a smaller size, which facilitates the layout and installation of the powertrain 2 in the vehicle. Furthermore, the powertrain 2 can save space in the electric vehicle 1, making it easier to arrange and install other functional components in the electric vehicle 1 to improve the overall performance of the electric vehicle 1.

[0064] The powertrain 2 in this application is described in detail below.

[0065] Please see Figure 3 , Figure 4 , Figure 5 and Figure 6 . Figure 3 A perspective view of a powertrain 2 provided in an embodiment of this application. Figure 4 A cross-sectional view of the powertrain 2 provided in an embodiment of this application. Figure 5 A perspective view of an intermediate integrated housing 30 provided in an embodiment of this application. Figure 6 A side view of an intermediate integrated housing 30 provided in an embodiment of this application.

[0066] This application provides a power assembly 2 with a reducer 20 side outlet. The power assembly 2 includes an intermediate integrated housing 30, a resolver sensor 40, a motor 10, and a reducer 20. The motor 10 receives drive from a motor controller 31 to drive the reducer 20. The intermediate integrated housing 30 includes an integrally die-cast partition 100 and two circumferential housings 200 (e.g., ...). Figure 3 and Figure 5 (As shown). Two circumferential housings 200 are arranged along axis A of the powertrain 2. One circumferential housing 200 is used to fix the motor stator 13 of a motor 10 and to house the motor rotor 12 of a motor 10 (as shown). Figure 4 As shown), another circumferential housing 200 is used to accommodate the gear set of a reducer 20. This other circumferential housing 200 includes at least one through-hole extending through the other circumferential housing 200. A partition 100 is used to separate the cavities of the two circumferential housings 200. The partition 100 includes a shaft hole 110, at least one cable outlet hole, and two end faces 101 opposite to each other along the axial direction A of the powertrain 2 (as shown). Figure 6 As shown), a shaft hole 110 and at least one outlet hole are used to connect the inner cavities of two circumferential housings 200. The shaft hole 110 is coaxially arranged with the input shaft of a reducer 20 or the motor shaft 11 of a motor 10. The distance between the center point of at least one outlet hole and the center point of the shaft hole 110 is greater than the inner diameter of the resolver stator 41 of a resolver sensor 40.

[0067] In this configuration, the axial direction A of the powertrain 2 is parallel to the axial direction A of the motor shaft 11 and also parallel to the axial direction A of the input shaft of the reducer 20. A partition 100 is arranged between two circumferential housings 200 along the axial direction A of the powertrain 2. Each of the two circumferential housings 200 has an opening on one side facing a partition 100. The two end faces 101 of the partition 100 respectively cover the openings of the two circumferential housings 200 and are fixed to the two circumferential housings 200 (see reference). Figure 4 and Figure 6 ).

[0068] One partition 100 and two circumferential housings 200 are integrally formed. That is, the intermediate integrated housing 30 is an integral structure, which improves the connection strength between the partition 100 and the two circumferential housings 200. The overall strength of the intermediate integrated housing 30 is high, which is beneficial to improving the performance of the powertrain 2.

[0069] For ease of description, one circumferential housing 200 is defined as circumferential housing 200a, and the other circumferential housing 200 is defined as circumferential housing 200b. The inner cavity of circumferential housing 200a is used to house the resolver stator 41 and the motor stator 13. The inner cavity of circumferential housing 200a is also used to house the resolver rotor 42 of the resolver sensor 40, the motor rotor 12, and at least a portion of the motor shaft 11. The resolver sensor 40 is used to monitor the rotational speed of the motor shaft 11 and track the position of the motor rotor 12. The resolver stator 41 is sleeved on the resolver rotor 42, and the resolver rotor 42 is sleeved on and fixed to the motor shaft 11. The resolver rotor 42 can rotate with the motor shaft 11 and rotate relative to the resolver stator 41. In one embodiment, the resolver stator 41 of the resolver sensor 40 is electrically connected to the motor controller 31. The resolver stator 41 senses the rotational movement of the resolver rotor 42 and converts it into a signal, which is transmitted to the motor controller 31. The motor controller 31 obtains the real-time rotational speed of the motor shaft 11 by analyzing the signal.

[0070] The inner cavity of the circumferential housing 200b is used to house the gear set of the reducer 20. Generally, the gear set includes a shaft, gears, and reducer bearings. The input shaft of the reducer 20 is one of the shafts in the gear set. At least a portion of the input shaft of the reducer 20 is housed within the inner cavity of the circumferential housing 200b. At least one through hole in the circumferential housing 200b can be used to connect the inner cavity of the circumferential housing 200b with the inner cavity of the motor controller 31.

[0071] A partition 100 includes a shaft hole 110 and at least one cable outlet hole, the shaft hole 110 and the at least one cable outlet hole extending through both end faces 101 of the partition 100 along the axial direction A of the powertrain 2. The shaft hole 110 and the at least one cable outlet hole are spaced apart along the radial direction R of the powertrain 2. The radial direction R of the powertrain 2 is perpendicular to the axial direction A of the powertrain.

[0072] The shaft hole 110 is used to accommodate at least one of the coupling end of the input shaft of the reducer 20 or the coupling end of the motor shaft 11 of the motor 10, wherein the coupling end of the input shaft of the reducer 20 is used for a drive connection to the coupling end of the motor shaft 11. Exemplarily, the shaft hole 110 is used to accommodate the coupling end of the motor shaft 11 by allowing the coupling end of the motor shaft 11 to enter the inner cavity of the circumferential housing 200b and be drive-connected to the coupling end of the input shaft of the reducer 20. Alternatively, the shaft hole 110 is used to accommodate the coupling end of the input shaft of the reducer 20 by allowing the coupling end of the input shaft of the reducer 20 to enter the inner cavity of the circumferential housing 200a and be drive-connected to the coupling end of the motor shaft 11. A drive connection can also be achieved between the coupling end of the motor shaft 11 and the coupling end of the input shaft of the reducer 20 within the shaft hole 110. The drive connection between the coupling end of the motor shaft 11 and the coupling end of the input shaft of the reducer 20 allows the power output from the motor shaft 11 to be transmitted to the input shaft of the reducer 20.

[0073] At least one outlet hole is arranged radially R between the resolver rotor 42 of a resolver sensor 40 and the circumferential housing 200a. The at least one outlet hole is used to accommodate the passage of connecting wires from various devices within the circumferential housing 200a. In one embodiment, the connecting wires are used to connect devices within the circumferential housing 200a to the motor controller 31. Exemplarily, the connecting wires include resolver connecting wires, which connect the resolver sensor 40 to the motor controller 31. The resolver sensor 40 receives electrical energy transmitted from the motor controller 31 through the resolver connecting wires. The resolver connecting wires can enter the inner cavity of the circumferential housing 200b through the outlet holes and connect to the motor controller 31 through a through-hole in the circumferential housing 200b. Exemplarily, the connecting wires may also include winding connecting wires, which connect the motor winding 14 to the motor controller 31. The motor winding 14 receives electrical energy transmitted from the motor controller 31 through the winding connecting wires. The winding connection wire can enter the inner cavity of the circumferential housing 200b through the wire outlet hole, and is connected to the motor controller 31 through the through hole of the circumferential housing 200b.

[0074] It is worth noting that the connecting line can be in the form of cable, cable including connector, copper busbar, etc. The connecting line can be any form used to realize the connection between devices.

[0075] In this embodiment of the application, a partition 100 includes at least one outlet hole connecting the inner cavity of the circumferential housing 200a and the inner cavity of the circumferential housing 200b, and the circumferential housing 200b includes at least one through hole connecting the inner cavity of the circumferential housing 200b and the inner cavity of the motor controller 31, so that the connection wires of the devices in the circumferential housing 200a can be connected to the motor controller 31 from the inner cavity of the circumferential housing 200a, through the outlet hole, the inner cavity of the circumferential housing 200b and the through hole in sequence. On the one hand, the components inside the circumferential housing 200a are connected to the motor controller 31 from the circumferential housing 200b on the reducer 20 side, making full use of the space between the circumferential housing 200b and the gear set of the reducer 20 along the radial direction R. The connection lines of the components inside the circumferential housing 200a do not need to occupy additional space along the axial direction A of the circumferential housing 200a, or the space along the axial direction A of the circumferential housing 200a occupied by the components inside the circumferential housing 200a is reduced. The components in the intermediate integrated housing 30 are arranged compactly, reducing the size of the powertrain 2 along the axial direction A, which is beneficial for the installation and arrangement of the powertrain 2 in the electric vehicle 1.

[0076] On the other hand, since the connecting wires of the devices in the circumferential housing 200a pass through the outlet hole 120 of the partition 100 and are connected to the motor controller 31 in the circumferential housing 200b, the connecting wires are concentrated in the middle position of the intermediate integrated housing 30 near the partition 100, which reduces the risk of the connecting wires being bumped or scratched, and improves the reliability of the connection between the connecting wires and the devices and motor controller 31 in the circumferential housing 200a.

[0077] In one embodiment, one end face 101 of the two end faces 101 facing the motor stator 13 of a motor 10 is used to fix the resolver stator 41 of a resolver sensor 40, and the resolver rotor 42 of a resolver sensor 40 is used to drive the motor shaft 11 of a motor 10 or the input shaft of a reducer 20. At least one wire outlet hole includes a first wire outlet hole 120, which is used to pass through the resolver connection wire between the resolver sensor 40 and the motor controller 31.

[0078] The resolver sensor 40 receives electrical energy transmitted from the motor controller 31 via a resolver connection cable. The resolver connection cable enters the inner cavity of the circumferential housing 200b through the first outlet hole 120 and connects to the motor controller 31 through the through hole of the circumferential housing 200b.

[0079] In this embodiment, the resolver sensor 40 is connected to the motor controller 31 from the circumferential housing 200b on the reducer 20 side. This fully utilizes the space between the circumferential housing 200b and the gear set of the reducer 20 along the radial direction R. The resolver connection line of the resolver sensor 40 does not need to occupy additional space along the axial direction A of the circumferential housing 200a, or the space occupied by the resolver connection line along the axial direction A of the circumferential housing 200a is reduced. The components in the intermediate integrated housing 30 are arranged compactly, reducing the size of the powertrain 2 along the axial direction A, which is beneficial for the installation and arrangement of the powertrain 2 in the electric vehicle 1. In addition, since the resolver connection line of the resolver sensor 40 passes through the first outlet hole 120 of the partition 100 and is connected to the motor controller 31 within the circumferential housing 200b, the resolver connection line is concentrated in the middle position of the intermediate integrated housing 30 near the partition 100. This reduces the risk of the resolver connection line being bumped or scratched, and improves the reliability of the connection between the resolver connection line and the resolver sensor 40 and the motor controller 31.

[0080] In one embodiment, the gear set of the reducer 20 includes an input shaft drive gear, which is sleeved and fixed to the input shaft of the reducer 20. The outer diameter of the input shaft drive gear is smaller than the outer diameter of the input shaft bearing 21. The input shaft drive gear is small in size, and there is a large gap between the radial input shaft drive gear and the inner wall of the circumferential housing 200b, which is used to accommodate part of the resolver connection wire. The gap between the input shaft drive gear and the inner wall of the circumferential housing 200b is fully utilized to facilitate the miniaturization of the powertrain 2.

[0081] In one embodiment, along the radial direction R, the projection of the resolver connecting line at least partially overlaps with the projection of the input shaft drive gear. Alternatively, the projection of the resolver connecting line lies between the projection of the input shaft drive gear and the projection of the partition 100.

[0082] Please see Figure 4 In one embodiment, the partition 100 faces one end face 101 of the motor stator 13 of a motor 10 for fixing the resolver stator 41 of the resolver sensor 40. The resolver sensor 40 is arranged between the motor stator 13 and the end face 101 along the powertrain 2 axis A.

[0083] In this embodiment, along axis A, the resolver stator 41 and resolver rotor 42 of the resolver sensor 40 are arranged between the motor stator 13 and the end face 101 of the partition plate 100 facing the motor stator 13. Since the resolver connection line of the resolver sensor 40 is connected to the motor controller 31 through the first outlet hole 120 and the inner cavity of the circumferential housing 200b, placing the resolver sensor 40 on the side of the motor stator 13 near the partition plate 100 helps to shorten the length of the resolver connection line, so as to facilitate the connection between the resolver sensor 40 and the motor controller 31.

[0084] In one embodiment, the partition 100 further includes a resolver fixing protrusion on one end face 101 facing the motor stator 13 of a motor 10. The resolver fixing protrusion is used to fix the resolver stator 41 of the resolver sensor 40. The resolver fixing protrusion protrudes from the end face 101 toward the resolver stator 41 along the powertrain 2 axis A. One end of the resolver fixing protrusion is fixed to the end face 101 along the powertrain 2 axis A, and the other end is used to fix the resolver stator 41. The resolver stator 41 and the resolver fixing protrusion can be fixedly connected by screws, pins, clips, or other means.

[0085] In this embodiment, by setting a resolver fixing protrusion, the resolver stator 41 is relatively fixed to the partition 100 to ensure that the resolver sensor 40 works normally.

[0086] In one embodiment, the resolver fixing protrusion and the partition 100 are integrally formed. The integral molding of the resolver fixing protrusion and the partition 100 improves the connection strength between the resolver fixing protrusion and the partition 100, and is more conducive to the stable fixing of the resolver stator 41 by the resolver fixing protrusion.

[0087] Please see Figure 6 and Figure 7 In one embodiment, the distance between the first cable outlet hole 120 and the shaft hole 110 along the radial direction R of the powertrain 2 is less than the inner diameter of the motor stator 13 of the motor 10, and the hole area of ​​the first cable outlet hole 120 is less than the hole area of ​​the shaft hole 110. Generally, the distance along the radial direction R between the motor stator 13 and the motor shaft 11 is greater than or equal to the distance between the resolver stator 41 and the motor shaft 11 (refer to reference). Figure 4 The motor stator 13 is arranged on the outer side of the resolver stator 41, away from the motor shaft 11. In this embodiment, the first outlet hole 120 is positioned closer to the shaft hole 110 along the radial direction R, making the first outlet hole 120 closer to the resolver stator 41. This shortens the length of the resolver connection line between the first outlet hole 120 and the resolver stator 41, which helps to miniaturize the powertrain 2 and streamline the wiring. In addition, the hole area of ​​the first outlet hole 120 is smaller than that of the shaft hole 110, reducing the opening area of ​​the partition 100 and improving the overall strength of the partition 100.

[0088] See also Figure 4 and Figure 7 In one embodiment, the lead-out end of the motor winding 14 of a motor 10 faces an end face 101, and at least one lead-out hole includes a second lead-out hole 130. The second lead-out hole 120 is used to pass through the winding connection wire between the motor winding 14 of the motor 10 and the motor controller 31. The end face 101 is the end face 101 of the partition 100 facing the motor stator 13 of the motor 10.

[0089] The second outlet hole 130 is used to allow the winding connection wires of the motor winding 14 to pass through. The motor winding 14 receives electrical energy transmitted by the motor controller 31 through the winding connection wires. The winding connection wires can enter the inner cavity of the circumferential housing 200b through the second outlet hole 130, and connect to the motor controller 31 through the through hole of the circumferential housing 200b.

[0090] In this embodiment, both the motor winding 14 and the resolver sensor 40 are connected to the motor controller 31 from the circumferential housing 200b on the reducer 20 side. On the one hand, the space between the circumferential housing 200b and the gear set of the reducer 20 along the radial direction R is fully utilized. The winding connection line and the resolver connection line do not need to occupy the space along the axial direction A of the circumferential housing 200a, or the space along the axial direction A of the circumferential housing 200a occupied by the winding connection line and the resolver connection line is reduced. The components in the intermediate integrated housing 30 are arranged compactly, which reduces the size of the powertrain 2 along the axial direction A, which is beneficial for the installation of the powertrain 2 in the electric vehicle 1.

[0091] On the other hand, the winding connection wires are concentrated in the middle of the intermediate integrated housing 30 near the partition 100, which reduces the risk of the winding connection wires being bumped or scratched by the wire harness and improves the reliability of the connection between the winding connection wires and the motor windings 14 and the motor controller 31.

[0092] On the other hand, the second outlet hole 130 is arranged alternately with the first outlet hole 120 and the shaft hole 110. The second outlet hole 130 is a hole different from the first outlet hole 120 and the shaft hole 110. The winding connecting wire and the resolver connecting wire pass through different outlet holes, which helps to improve the regularity of the circuit layout and reduce the risk of circuit misconnection.

[0093] See also Figure 4 and Figure 7In one embodiment, the distance between at least one outlet hole and the center point of the shaft hole 110 along the radial direction R of the powertrain 2 is less than the outer diameter of the motor stator 13 of the motor 10. Specifically, the distance between the center point of the first outlet hole 120 and the shaft hole 110 is less than the outer diameter of the motor stator 13 of the motor 10. The distance between the center point of the second outlet hole 130 and the shaft hole 110 is less than the outer diameter of the motor stator 13 of the motor 10. Generally, the distance between the outlet end of the motor winding 14 and the center point of the shaft hole 110 is less than the outer diameter of the motor stator 13 of the motor 10, and the outer diameter of the resolver stator 41 is less than the outer diameter of the motor stator 13 of the motor 10. In this embodiment, arranging at least one outlet hole along the radial direction R of the powertrain 2 between the shaft hole and the outer peripheral surface of the motor stator 13 reduces the length of the winding connection wires and resolver connection wires within the circumferential housing 200a, contributing to the miniaturization of the powertrain 2 and the standardization of the wiring. On the other hand, since the projection of at least one outlet hole along the axial direction A is located within the projection of the outer peripheral surface of the motor stator 13, the winding connection wire and the resolver connection wire do not occupy additional space along the radial direction R of the circumferential housing 200a, which is beneficial to reduce the size of the circumferential housing 200a along the radial direction R, thereby reducing the overall size of the powertrain 2.

[0094] Please see Figure 6 and Figure 7 In one embodiment, at least one cable outlet includes a first cable outlet 120 and a second cable outlet 130, arranged circumferentially around the powertrain 2. The second cable outlet 130 and the first cable outlet 120 are spaced apart. The projection of the second cable outlet 130 along the radial direction R of the powertrain 2 does not overlap with the projection of the first cable outlet 120. In this embodiment, since the second cable outlet 130 and the first cable outlet 120 are arranged radially R between the inner wall of the input shaft bearing cavity 102 and the inner wall of the circumferential housing 200a, and the space between the input shaft bearing cavity 102 and the inner wall of the circumferential housing 200a is limited, the circumferential arrangement of the second cable outlet 130 and the first cable outlet 120 reduces interference between winding connection lines. Furthermore, it improves the overall strength of the partition 100, making the structure of the second cable outlet 130 and the first cable outlet 120 less prone to damage.

[0095] Please see Figure 6 and Figure 7 In one embodiment, the distance between the second outlet hole 130 and the shaft hole 110 along the radial direction R of the powertrain 2 is greater than or equal to the distance between the first outlet hole 120 and the shaft hole 110. Generally, the distance between the motor winding 14 and the motor shaft 11 along the radial direction R is greater than or equal to the distance between the resolver stator 41 and the motor shaft 11 (refer to reference). Figure 4The motor windings 14 are arranged on the outer side of the resolver stator 41, away from the motor shaft 11. In this embodiment, the second outlet hole 130 is positioned further away from the shaft hole 110 along the radial direction R, making the second outlet hole 130 closer to the motor windings 14. This shortens the length of the winding connection line between the second outlet hole 130 and the motor windings 14, contributing to the miniaturization of the powertrain 2 and the standardization of the wiring. The first outlet hole 120 is positioned further closer to the shaft hole 110 along the radial direction R, making the first outlet hole 120 closer to the resolver stator 41. This shortens the length of the resolver connection line between the first outlet hole 120 and the resolver stator 41, contributing to the miniaturization of the powertrain 2 and the standardization of the wiring.

[0096] Please see Figure 6 and Figure 7 In one embodiment, the area of ​​the second outlet hole 130 is greater than or equal to the area of ​​the first outlet hole 120. Generally, the motor winding 14 is connected to high-voltage electricity, and the resolver sensor 40 is connected to low-voltage electricity. The winding connecting wire is larger than the resolver connecting wire, and the winding connecting wire is typically made of copper. In this embodiment, the area of ​​the second outlet hole 130 is larger than the area of ​​the first outlet hole 120 to facilitate the smooth passage of the winding connecting wire through the second outlet hole 130.

[0097] Please see Figure 6 and Figure 7 In one embodiment, the width of the second outlet hole 130 along the circumferential direction of the powertrain 2 is greater than the width of the second outlet hole 130 along the radial direction R of the powertrain 2. The width of the first outlet hole 120 along the circumferential direction of the powertrain 2 is greater than the width of the first outlet hole 120 along the radial direction R of the powertrain 2. In this embodiment, since the second outlet hole 130 and the first outlet hole 120 are both arranged radially R between the input shaft bearing cavity 102 and the inner wall of the circumferential housing 200a, the space between the input shaft bearing cavity 102 and the inner wall of the circumferential housing 200a is limited. Extending the circumferential dimensions of the second outlet hole 130 and the first outlet hole 120 and shortening the radial dimensions of the second outlet hole 130 and the first outlet hole 120 helps to reduce the risk of contact interference between the winding connection wires and the resolver connection wires and other components within the circumferential housing 200a along the radial direction R.

[0098] In one embodiment, the width of the second outlet hole 130 along the circumference of the powertrain 2 is greater than the width of the first outlet hole 120 along the circumference of the powertrain 2.

[0099] Please see Figure 6 and Figure 7In one embodiment, at least one through-hole includes a first through-hole 210 and a second through-hole 220, which are spaced apart along the circumferential and axial directions A of the powertrain 2. The first through-hole 210 is used to pass through a resolver connection wire between a resolver sensor 40 and a motor controller 31. The second through-hole 220 is used to pass through a motor winding 14 of a motor 10 and a winding connection wire between a motor controller 31 and a motor winding 14 of a motor 10.

[0100] In this embodiment, the second through hole 220 and the first through hole 210 are arranged at intervals. The second through hole 220 is a through hole different from the first through hole 210, and the winding connection wire and the resolver connection wire are connected to the motor controller 31 through different through holes. The small diameters of the second through hole 220 and the first through hole 210 are beneficial to the sealing between the circumferential housing 200b and the motor controller 31.

[0101] Please see Figure 7 In one embodiment, along the axial direction A of the powertrain 2, the distance between the second through hole 220 and the partition 100 is less than the distance between the first through hole 210 and the partition 100. In this embodiment, the second through hole 220 and the first through hole 210 are offset along the axial direction A, reducing the space occupied by the second through hole 220 and the first through hole 210 in the radial direction R of the circumferential housing 200b. This is beneficial for reducing the size of the powertrain 2. In addition, generally, the motor winding 14 is connected to high voltage, and the resolver sensor 40 is connected to low voltage. The winding connection wires are relatively large, and the winding connection wires are usually made of copper. The second through hole 220 is closer to the partition 100, which facilitates the fixing of the winding connection wires and reduces the risk of interference between the winding connection wires and the gear set of the reducer 20.

[0102] Please see Figure 7 In one embodiment, the number of second through holes 220 is greater than the number of first through holes 210. Furthermore, the distance between each second through hole 220 and the partition 100 is less than the distance between each first through hole 210 and the partition 100. For example, Figure 7 The device includes a first through hole 210 and three second through holes 220. The three second through holes 220 are used to accommodate the passage of the three-phase winding connection wires. The three second through holes 220 have the same through direction and are perpendicular to the axial direction A. In this embodiment, the larger number of second through holes 220 are closer to the partition plate 100, which facilitates the fixing of the winding connection wires and reduces the risk of interference between the winding connection wires and the gear set of the reducer 20.

[0103] Please see Figure 7In one embodiment, the through-hole 210 is perpendicular to the through-hole 220. For example, the through-hole 210 is parallel to axis A, and the through-hole 220 is perpendicular to axis A. The different through-hole directions of the first through-hole 210 and the second through-hole 220 fully utilize the inner walls of the circumferential housing 200b, which helps to centrally arrange the first through-hole 210 and the second through-hole 220, thereby reducing the size of the powertrain 2.

[0104] Please see Figure 7 In one embodiment, along the radial direction R of the powertrain 2, the distance between the second through hole 220 and the shaft hole 110 is greater than or equal to the distance between the first through hole 210 and the shaft hole 110. In this embodiment, since the winding connection wire is relatively large and there are generally many second through holes 220, the second through holes 220 are set away from the shaft hole 110, which facilitates the arrangement of the resolver connection wire between the first through hole 210 and the first outlet hole 120, and also facilitates the resolver connection wire to connect to the motor controller 31 through the first through hole 210.

[0105] Please see Figure 7 In one embodiment, along the axial direction A of the powertrain 2, the distance between the second through hole 220 and the shaft hole 110 is greater than or equal to the radius of a circumferential housing 200, and the distance between the first through hole 210 and the shaft hole 110 is greater than or equal to the radius of a circumferential housing 200b. The circumferential housing 200 refers to a circumferential housing 200a used to house the motor stator 13. Along the radial direction R of the powertrain, the width of the circumferential housing 200a is less than the width of the circumferential housing 200b. The motor controller 31 is mainly integrated or fixed to the circumferential housing 200b, which is located away from the circumferential housing 200a, thus reducing the size of the motor controller 31. The second through hole 220 and the first through hole 210 are opened in the part of the circumferential housing 200b away from the circumferential housing 200a. The connection path between the second through hole 220 and the first through hole 210 and the motor controller 31 is relatively short, which facilitates the connection of the winding connection line and the resolver connection line to the motor controller 31, and is also beneficial to the sealing between the inner cavity of the circumferential housing 200b and the inner cavity of the motor controller 31.

[0106] Please see Figure 6 and Figure 7 In one embodiment, the other end face 101 of the partition 100, facing away from the motor stator 13, includes an input shaft bearing cavity 102. The input shaft bearing cavity 102 is used to fix the outer ring of the input shaft bearing 21. The inner ring of the input shaft bearing 21 is used to drive the input shaft of the reducer 20, and the shaft hole 110 and the input shaft bearing cavity 102 are arranged coaxially.

[0107] The input shaft bearing 21 is used to bear the load transmitted from the input shaft of the reducer 20 to the partition 100. The input shaft of the reducer 20 is rotatably connected to the partition 100 via the input shaft bearing 21. The opening of the input shaft bearing cavity 102 faces the circumferential housing 200b.

[0108] In this embodiment, the resolver sensor 40 and the input shaft bearing cavity 102 are respectively disposed on two opposite end faces 101, which helps to organize the arrangement of the components of the powertrain 2 and facilitates the maintenance of the powertrain 2.

[0109] Please see Figure 6 and Figure 7 In one embodiment, the other end face 101 of the partition 100, facing away from the motor stator 13, includes an input shaft bearing cavity 102, an intermediate shaft bearing cavity 103, and an output shaft bearing cavity 104. The intermediate shaft bearing cavity 103 is used to fix the outer ring of the intermediate shaft bearing, and the inner ring of the intermediate shaft bearing is used to drive the intermediate shaft of the reducer 20. The output shaft bearing cavity 104 is used to fix the outer ring of the intermediate shaft bearing, and the inner ring of the output shaft bearing is used to drive the output shaft of the reducer 20. The distance between the output shaft bearing cavity 104 and the shaft hole 110 is greater than the distance between the intermediate shaft bearing cavity 103 and the shaft hole 110, and the distance between at least one cable outlet hole and the input shaft bearing cavity 102 is less than the distance between at least one cable outlet hole and the output shaft bearing cavity 104.

[0110] For example, the gear set of the reducer 20 includes an input shaft gear set, an intermediate shaft gear set, and an output shaft gear set. The input shaft gear set includes the input shaft of the reducer 20 and an input shaft drive gear. The input shaft of the reducer 20 is rotatably connected to the partition 100 via an input shaft bearing 21, and the outer ring of the input shaft bearing 21 is fixed to the input shaft bearing cavity 102.

[0111] The intermediate shaft gear set includes an intermediate shaft of the reducer 20, an intermediate shaft bearing, an intermediate shaft driven gear, and an intermediate shaft driving gear. The intermediate shaft driven gear and the intermediate shaft driving gear are fixed and sleeved on the intermediate shaft of the reducer 20, and are spaced apart along the axial direction of the intermediate shaft. The intermediate shaft of the reducer 20 and the input shaft of the reducer 20 are spaced apart along the radial direction R of the input shaft of the reducer 20. The intermediate shaft of the reducer 20 is rotatably connected to the partition plate 100 via the intermediate shaft bearing, and the outer ring of the intermediate shaft bearing is fixed to the intermediate shaft bearing cavity 103. The intermediate shaft driven gear is used to mesh with the input shaft driving gear along the radial direction R of the input shaft driving gear.

[0112] The output shaft gear set includes the output shaft of the reducer 20, an output shaft bearing, and an output shaft driven gear. The output shaft driven gear is fixed and sleeved on the output shaft of the reducer 20. The output shaft and the intermediate shaft of the reducer 20 are arranged at intervals along the radial direction R of the intermediate shaft of the reducer 20. The output shaft of the reducer 20 is rotatably connected to the partition plate 100 through the output shaft bearing, and the outer ring of the output shaft bearing is fixed in the output shaft bearing cavity 104. The output shaft driven gear is used to mesh with the intermediate shaft driving gear along the radial direction R of the intermediate shaft driving gear.

[0113] The power output from the motor shaft 11 passes sequentially through the input shaft of the reducer 20, the input shaft drive gear, the intermediate shaft driven gear, the intermediate shaft, the intermediate shaft drive gear, the output shaft driven gear, and the output shaft of the reducer 20, and is transmitted to the wheel 4 through the output shaft of the reducer 20.

[0114] In this embodiment, at least one outlet hole, such as the first outlet hole 120 and the second outlet hole 130, is arranged on the periphery of the input shaft bearing cavity 102 away from the output shaft bearing cavity 104. This helps to organize the arrangement of the resolver connection wire and the winding connection wire in the circumferential housing 200b and reduces the risk of interference between the resolver connection wire and the winding connection wire and the gear set of the reducer 20.

[0115] In one embodiment, the distance between the first outlet hole 120 and the input shaft bearing cavity 102 is less than the distance between the first outlet hole 120 and the intermediate shaft bearing cavity 103, and less than the distance between the first outlet hole 120 and the output shaft bearing cavity 104. The distance between the second outlet hole 130 and the input shaft bearing cavity 102 is less than the distance between the second outlet hole 130 and the intermediate shaft bearing cavity 103, and less than the distance between the second outlet hole 130 and the output shaft bearing cavity 104. The input shaft bearing cavity 102 and the intermediate shaft bearing cavity 103 are spaced apart along a radial direction R of the intermediate shaft bearing cavity 103, and the intermediate shaft bearing cavity 103 and the output shaft bearing cavity 104 are spaced apart along a radial direction R of the intermediate shaft bearing cavity 103.

[0116] In this embodiment, the first outlet hole 120 and the second outlet hole 130 are arranged on the periphery of the input shaft bearing cavity 102 away from the intermediate shaft bearing cavity 103 and the output shaft bearing cavity 104. This helps to organize the arrangement of the resolver connection line and the winding connection line in the circumferential housing 200b and reduces the risk of interference between the resolver connection line and the winding connection line and the gear set of the reducer 20.

[0117] In one embodiment, the shaft hole 110, the input shaft bearing cavity 102, and the first outlet hole 120 are arranged radially R along the powertrain 2. In this embodiment, the first outlet hole 120 is arranged on the outer side of the input shaft bearing cavity 102 along the radial R of the powertrain 2. The distance between the center of the first outlet hole 120 and the center of the shaft hole 110 is greater than the outer diameter of the input shaft bearing cavity 102. Along the axial direction A of the powertrain 2, the projection of the first outlet hole 120 does not overlap with the projection of the input shaft bearing cavity 102, and the opening position of the first outlet hole 120 avoids the input shaft bearing cavity 102, which facilitates the smooth connection of the resolver cable in the circumferential housing 200b to the motor controller 31.

[0118] Please see Figure 6 and Figure 7 In one embodiment, the shaft hole 110, the input shaft bearing cavity 102, and the second outlet hole 130 are arranged radially R along the powertrain 2. In this embodiment, the second outlet hole 130 is arranged on the outer side of the input shaft bearing cavity 102 along the radial R of the powertrain 2. The distance between the center of the second outlet hole 130 and the center of the shaft hole 110 is greater than the outer diameter of the input shaft bearing cavity 102. Along the axial direction A of the powertrain 2, the projection of the second outlet hole 130 does not overlap with the projection of the input shaft bearing cavity 102, and the opening position of the second outlet hole 130 avoids the input shaft bearing cavity 102, which facilitates the smooth connection of the winding connection wires in the circumferential housing 200b to the motor controller 31. Please refer to... Figure 6 and Figure 7 In one embodiment, along the circumferential direction of the powertrain 2, the second cable outlet 130, the first cable outlet 120, and the intermediate shaft bearing cavity 103 are arranged sequentially at intervals. The second cable outlet 130, the first cable outlet 120, and the intermediate shaft bearing cavity 103 are all arranged around the input shaft bearing cavity 102. Along the radial direction R of the powertrain 2, the projections of the second cable outlet 130, the first cable outlet 120, and the intermediate shaft bearing cavity 103 do not overlap. The first cable outlet 120 and the second cable outlet 130 are arranged on the circumferential side of the input shaft bearing cavity 102 away from the intermediate shaft bearing cavity 103, which helps to regulate the arrangement of the resolver connection wires and winding connection wires within the circumferential housing 200b and reduces the risk of interference between the resolver connection wires and winding connection wires and the gear set of the reducer 20.

[0119] Please see Figure 6 and Figure 7 In one embodiment, the distance between the first cable outlet 120 and the intermediate shaft bearing cavity 103 is smaller than the distance between the second cable outlet 130 and the intermediate shaft bearing cavity 103. Generally, along the radial direction R of the powertrain 2, such as Figure 6In the upper and lower positions, the distance between the intermediate shaft bearing cavity 103 and the motor controller 31 is greater than the distance between the input shaft bearing cavity 102 and the motor controller 31. The resolver connection wire between the first outlet hole 120 and the first through hole 210 is usually a cable, and the winding connection wire between the second outlet hole 130 and the second through hole 220 is usually a copper busbar. In this embodiment, because the distance between the second outlet hole 130 and the intermediate shaft bearing cavity 103 is large, and the distance between the second outlet hole 130 and the motor controller 31 is close, it is convenient to arrange the winding connection wire between the second outlet hole 130 and the second through hole 220. The distance between the first outlet hole 120 and the intermediate shaft bearing cavity 103 is small, and the distance between the first outlet hole 120 and the motor controller 31 is far, but the resolver connection wire in cable form has good bending degree, and the resolver connection wire between the first outlet hole 120 and the first through hole 210 can also be arranged relatively smoothly.

[0120] Please see Figure 6 and Figure 7 In one embodiment, the first outlet hole 120 and the second outlet hole 130 are respectively distributed on both sides of the line connecting the center of the input shaft bearing cavity 102 and the center of the intermediate shaft bearing cavity 103. The first outlet hole 120 and the second outlet hole 130 are arranged on the periphery of the input shaft bearing cavity 102 away from the intermediate shaft bearing cavity 103, and are respectively arranged on both sides of the line connecting the center of the input shaft bearing cavity 102 and the center of the intermediate shaft bearing cavity 103. This arrangement allows the first outlet hole 120 and the second outlet hole 130 to be closer to the inner wall of the circumferential housing 200b along the radial direction R of the powertrain 2. This facilitates the regularization of the arrangement of the resolver connection wires and winding connection wires within the circumferential housing 200b, reducing the risk of interference between the resolver connection wires and winding connection wires and the gear set of the reducer 20.

[0121] In one embodiment, the distance between the first cable outlet 120 and the intermediate shaft bearing cavity 103 is less than the distance between the first cable outlet 120 and the output shaft bearing cavity 104. The distance between the second cable outlet 130 and the intermediate shaft bearing cavity 103 is less than the distance between the second cable outlet 130 and the output shaft bearing cavity 104.

[0122] In one embodiment, the other end face of the partition 100 opposite to the motor stator 13 includes a wiring harness fixing member for neatly fixing the resolver connection wires within the circumferential housing 200b. Along the circumference of the powertrain 2, the wiring harness fixing member is arranged between the first outlet hole 120 and the second outlet hole 130. In one embodiment, the wiring harness fixing member may include a connector connected to the motor controller 31. The resolver connection wires extending from the first outlet hole 120 to the circumferential housing 200b can be plugged into the connector to achieve a connection between the resolver sensor 40 and the motor controller 31.

[0123] See also Figure 4 and Figure 6 In one embodiment, the motor 10 further includes a motor winding 14, and the inner cavity of a circumferential housing 200 is used to house the motor winding 14. The projection of the second outlet hole 130 along the axial direction A of the powertrain 2 at least partially overlaps with the projection of the motor winding 14, or the projection of the second outlet hole 130 is located within the projection of the motor winding 14 along the radial direction R. The circumferential housing 200 is a circumferential housing 200a that houses the motor stator 13.

[0124] In this embodiment, the projection of the second outlet hole 130 along the axial direction A at least partially overlaps with the projection of the motor winding 14 along the axial direction A. Therefore, the second outlet hole 130 and the motor winding 14 are arranged in a straight line or approximately straight line along the axial direction A, shortening the length of the winding connection line between the second outlet hole 130 and the motor winding 14. This contributes to the miniaturization of the powertrain 2 and the regularization of the wiring. Furthermore, the winding connection line between the second outlet hole 130 and the motor winding 14 is typically a copper busbar. The straight line or approximately straight line arrangement of the second outlet hole 130 and the motor winding 14 eliminates the need for bending or minimizes the bending of the copper busbar, reducing the risk of copper busbar breakage and improving the connection reliability between the motor winding 14 and the motor controller 31.

[0125] On the other hand, the projection of the second outlet hole 130 is located within the projection of the motor winding 14 along the radial direction R, so that the outlet end of the motor winding 14 can be set inside the motor winding 14 to reduce the size of the powertrain 2 along the axial direction A.

[0126] See also Figure 4 and Figure 6 In one embodiment, a first outlet hole 120 is arranged radially R between the motor winding 14 and the shaft hole 110 of the powertrain 2. The distance between the first outlet hole 120 and the shaft hole is less than the distance between the motor winding 14 and the shaft hole along the radial direction R of the powertrain 2. In this embodiment, the resolver connecting wire housed in the circumferential housing 200a is arranged radially R between the motor winding 14 and the shaft hole 110. The projection of the resolver connecting wire along the axial direction A of the powertrain 2 does not overlap with the projection of the motor winding 14, and the overall axial space occupied by the resolver connecting wire and the motor winding 14 is small, thus reducing the size of the powertrain 2 along the axial direction A.

[0127] Please see Figure 4 In one embodiment, the motor shaft 11, resolver sensor 40, and motor winding 14 are arranged in sequence along the radial direction R of the powertrain 2. The projection of the resolver sensor 40 along the radial direction R of the powertrain 2 at least partially overlaps with the projection of the motor winding 14.

[0128] The motor stator 13 includes multiple winding slots that extend through the stator 13 along the axial direction A of the motor 10. Motor windings 14 are mounted on the stator 13; part of the motor windings 14 are housed within the winding slots, while another part is located outside the slots and protrudes from both ends of the stator 13 along the axial direction A. The length of the motor windings 14 along the axial direction A is greater than the length of the stator 13 and greater than the length of the rotor 12. Along the axial direction A, the distance between the motor windings 14 and the partition plate 100 is less than the distance between the stator 13 and the partition plate 100, and less than the distance between the rotor 12 and the partition plate 100.

[0129] In this embodiment, since the end of the motor winding 14 protrudes from the motor stator 13 and the motor rotor 12, there is a receiving space between the motor winding 14 and the motor shaft 11 along the radial direction R of the motor 10, and the resolver sensor 40 is received within this receiving space. This embodiment fully utilizes the receiving space between the motor winding 14 and the motor shaft 11, and installs the resolver sensor 40 along the radial direction R of the motor 10 between the motor winding 14 exposed on the motor stator 13 and the motor shaft 11. The resolver sensor 40 does not need to occupy additional space along the axial direction A of the motor shaft 11, or the space occupied by the resolver sensor 40 along the axial direction A of the motor shaft 11 is reduced. The components within the circumferential housing 200a are arranged compactly, reducing the size of the circumferential housing 200a along the axial direction A, which is beneficial for the miniaturization of the powertrain 2.

[0130] In one embodiment, the projection of the input shaft bearing cavity 102 along the radial direction R of the powertrain 2 at least partially overlaps with the projection of the motor winding 14. The input shaft bearing cavity 102 is recessed from one end face 101 toward the other end face 101. One end face 101 refers to the end face facing the circumferential housing 200b. The input shaft bearing cavity 102 occupies part of the receiving space between the motor winding 14 and the motor shaft 11, reducing the axial dimension A of the circumferential housing 200b and facilitating the miniaturization of the powertrain 2.

[0131] In one embodiment, along the radial direction R of the powertrain 2, the projection of the input shaft bearing cavity 102 at least partially overlaps with the projection of the winding connection line housed in the circumferential housing a. The input shaft bearing cavity 102 is recessed from one end face 101 toward the other end face 101, such that the input shaft bearing cavity 102 occupies part of the space between the winding connection line and the motor shaft 11, reducing the axial dimension A of the circumferential housing 200b, which is beneficial for miniaturization of the powertrain 2.

[0132] See also Figure 5 and Figure 7In one embodiment, the powertrain further includes a housing of a motor controller 31, the inner cavity of which communicates with the inner cavity of another circumferential housing 200 via a first through-hole 210 and a second through-hole 220. Along the arrangement direction of the housing of the motor controller 31 and the partition 100, the distance between the first cable outlet 120 and the housing of the motor controller 31 is greater than the distance between the second cable outlet 130 and the housing of the motor controller 31. The other circumferential housing 200 is a circumferential housing 200b that houses the gear set of the reducer 30. Figure 6 As shown, the housing of the motor controller 31 is integrated on top of the circumferential housing 200b.

[0133] In this embodiment, the second outlet hole 130 is closer to the motor controller 31 along the arrangement direction of the housing and partition 100 of the motor controller 31, which is beneficial for the arrangement of the winding connection wires between the second outlet hole 130 and the second through hole 220. Generally, the winding connection wires between the second outlet hole 130 and the second through hole 220 are usually copper busbars, and the copper busbars between the second outlet hole 130 and the second through hole 220 can connect the motor winding 14 and the motor controller 31 without bending or with minimal bending. Figure 8 In this configuration, the winding connection wire exiting from the second outlet hole 130 is connected to the motor controller 31 via a straight copper busbar 15. Furthermore, since the resolver connection wire between the first outlet hole 120 and the first through hole 210 is typically a cable with good bending properties, the connection between the resolver sensor 40 and the motor controller 31 can be smoothly achieved even at a relatively large distance between the first outlet hole 120 and the motor controller 31. For example, as... Figure 8 In the direction indicated by the middle arrow, the resolver connecting wire that passes through the first outlet hole 120 can wrap around the outside of the input shaft bearing cavity 102, go above the second outlet hole 130, and then connect to the motor controller 31 through the first through hole 210.

[0134] In one embodiment, along the arrangement direction of the housing and partition 100 of the motor controller 31, the distance between the second outlet hole 130 and the second through hole 220 is smaller than the distance between the first outlet hole 120 and the first through hole 210. This helps to ensure the neat arrangement of the resolver connection wires and winding connection wires within the circumferential housing 200b.

[0135] In one embodiment, at least a portion of the housing of the motor controller 31 and the intermediate integrated housing 30 are integrally formed. The integral die-casting of at least a portion of the housing of the motor controller 31 and the intermediate integrated housing 30 improves the connection strength between them.

[0136] Combined with reference Figure 5 and Figure 7In one embodiment, a portion of the motor controller 31's housing is integrated into the circumferential housing 200b, and the motor controller 31's housing and the circumferential housing 200b share a common housing. In this embodiment, the first through hole 210 and the second through hole 220 are formed in the common housing between the motor controller 31's housing and the circumferential housing 200b. A seal is required between the motor controller 31's housing and the circumferential housing 200b. Sealing the resolver connection wire with the wall of the first through hole 210 and sealing the winding connection wire with the wall of the second through hole 220 achieves the seal between the motor controller 31's housing and the circumferential housing 200b. The sealing operation is relatively simple and the sealing reliability is high.

[0137] In one embodiment, the circumferential housing 200b includes a boss that protrudes from the inner wall of the circumferential housing 200b toward a direction away from the housing of the motor controller 31. The outer wall of the boss forms the inner wall of the housing of the motor controller 31. The presence of the boss reduces the clearance between the gear set of the reducer 20 and the circumferential housing 200b, and the reduced space is used to house the motor controller 31, thereby reducing the size of the powertrain 2 along the arrangement direction of the housing of the motor controller 31 and the partition 100.

[0138] In one embodiment, along the arrangement direction of the housing of the motor controller 31 and the partition 100, the projection of the housing of the motor controller 31 at least partially overlaps with the projection of the circumferential housing 200b. Along the circumferential A of the powertrain 2, the projection of the housing of the motor controller 31 at least partially overlaps with the projection of the circumferential housing 200b. The compact arrangement of components in the powertrain 2 and the high space utilization rate reduce the volume of the powertrain 2.

[0139] Please see Figure 3 and Figure 4 In one embodiment, the powertrain 2 includes another motor 10, another reducer 20, another intermediate integrated housing 30, a partition 33, and two end plates 34. The partition 33 is used to fixably connect to another circumferential housing 200 of the intermediate integrated housing 30 to form a reducer receiving cavity, which accommodates one reducer 20. The partition 33 is also used to fixably connect to another circumferential housing 200 of the intermediate integrated housing 30 to form another reducer receiving cavity, which accommodates another reducer 20. One end plate 34 is used to fixably connect to a circumferential housing 200 of the intermediate integrated housing 30 to form a motor receiving cavity, which accommodates one motor 10. The other end plate 34 is used to fixably connect to a circumferential housing 200 of the other intermediate integrated housing 30 to form another motor receiving cavity, which accommodates another motor 10.

[0140] Along the axis A of the powertrain 2, an end plate 34, a circumferential housing 200a of an intermediate integrated housing 30, a partition 100 of an intermediate integrated housing 30, a circumferential housing 200b of an intermediate integrated housing 30, a middle partition 33, a circumferential housing 200b of another intermediate integrated housing 30, a partition 100 of another intermediate integrated housing 30, a circumferential housing 200a of another intermediate integrated housing 30, and another end plate 34 are arranged in sequence.

[0141] The partition plate 33 can be fixedly connected to the two intermediate integrated housings 30 by bolts, pins, or other means. The partition plate 33 can be a flat plate. In one embodiment, the two end faces of the partition plate 33 along the axial direction A include grooves. After the partition plate 33 is installed on the two intermediate integrated housings 30, the inner cavity of one groove communicates with the inner cavity of a circumferential housing 200b to form a reducer receiving cavity, which is used to accommodate the gear set of the reducer 20.

[0142] In this embodiment, the powertrain 2 integrates two motors 10 and two reducers 20, which can increase the integration of the powertrain 2, reduce its size and cost, facilitate the lightweight design of the powertrain 2, and improve its power density.

[0143] It is worth noting that the structure and positional arrangement of the other motor 10, the other reducer 20, and the other intermediate integrated housing 30 can be referred to the above description of an intermediate integrated housing 30, a motor 10, and a reducer 20, and will not be repeated here.

[0144] In one embodiment, the powertrain 2 includes another resolver sensor 40, and the end face of the partition 100 of another intermediate integrated housing 30 facing another motor stator 13 is used to fix the other resolver sensor 40. Along the axial direction A of the powertrain 2, the distance between one resolver sensor 40 and the other resolver sensor 40 is greater than the distance between the partition 100 of one intermediate integrated housing 30 and the partition 100 of the other intermediate integrated housing 30, and less than the distance between the motor stator 13 of one motor 10 and the motor stator 13 of the other motor 10.

[0145] Along axis A of the powertrain 2, two resolver sensors 40 are arranged inside the two motor stators 13 and outside the two partitions 100. Both resolver sensors 40 have their wiring exiting from the inside of the two partitions 100, i.e., the reducer 20 side. The resolver connection wires of the two resolver sensors 40 are connected to the motor controller 31 through the inner cavities of the two circumferential housings 200b, which helps to reduce the axial length of the powertrain 2 and improve its adaptability. Furthermore, because the resolver connection wires of the two resolver sensors 40 are arranged inside the two motor stators 13, the risk of impact or scratches to the resolver connection wires is reduced, improving the reliability of the connection between the resolver connection wires and the resolver sensors 40 and the motor controller 31.

[0146] In one embodiment, along the axial direction A of the powertrain 2, the projection of the shaft hole 110 of one partition 100 at least partially overlaps with the projection of the shaft hole 110 of the other partition 100, and the projection of the first cable outlet hole 120 of one partition 100 at least partially overlaps with the projection of the first cable outlet hole 120 of the other partition 100. The symmetrical arrangement of the shaft holes 110 of the two partitions 100 and the symmetrical arrangement of the first cable outlet holes 120 of the two partitions 100 optimizes the internal layout of the powertrain 2 and facilitates the installation and arrangement of internal components of the powertrain 2.

[0147] In one embodiment, along axis A of the powertrain 2, the projection of the second cable outlet 130 of one partition 100 at least partially overlaps with the projection of the second cable outlet 130 of the other partition 100. The symmetrical arrangement of the second cable outlets 130 of the two partitions 100 optimizes the internal layout of the powertrain 2.

[0148] In one embodiment, the powertrain 2 includes an intermediate integrated housing 30. A circumferential housing 200a of the intermediate integrated housing 30 houses a motor stator 13 and a motor rotor 12 of a motor 10, and a resolver stator 41 and a resolver rotor 42 of a resolver sensor 40. A circumferential housing 200b of the intermediate integrated housing 30 houses a gear set of a reducer 20. The powertrain 2 also includes a motor end cover and a reducer end cover. The motor end cover and the reducer end cover are arranged on both sides of the intermediate integrated housing 30 along the powertrain axis A. The motor end cover is used to fix the end face of the circumferential housing 200a away from the partition 100 along the axis A. The reducer end cover is used to fix the end face of the circumferential housing 200b away from the partition 100 along the axis A.

[0149] Please see Figure 3 and Figure 4This application provides an integrated dual-motor powertrain 2, which includes two motors 10, two reducers 20, two resolver sensors 40, two intermediate integrated housings 30, and a partition 33. Each intermediate integrated housing 30 includes an integrally die-cast partition 100 and two circumferential housings 200. The two circumferential housings 200 of each intermediate integrated housing 30 are arranged along the axial direction A of the powertrain 2. One circumferential housing 200 is used to fix the motor stator 13 of one motor 10 and to house the motor rotor 12 of one motor 10, and the other circumferential housing 200 is used to house the gear set of one reducer 20. The partition 33 includes two mounting surfaces along the axial direction A of the powertrain 2, each mounting surface for fixing the other circumferential housing 200 of one intermediate integrated housing 30. The other circumferential housing 200 of each intermediate integrated housing 30 includes at least one through hole, which penetrates the other circumferential housing 200. Each intermediate integrated housing 30 includes a partition 100 comprising a shaft hole 110, at least one cable outlet, and two opposite end faces 101 along the powertrain axis. The shaft hole 110 and at least one cable outlet are used to connect the cavities of two circumferential housings 200 within the same intermediate integrated housing 30. Each shaft hole 110 is coaxially aligned with the input shaft of a reducer 20 or the motor shaft 11 of a motor 10. The distance between the center point of at least one cable outlet and the shaft hole 110 is greater than the inner diameter of the resolver stator 41 of a resolver sensor 40.

[0150] In this embodiment, the powertrain 2 integrates two motors 10 and two reducers 20, which can increase the integration of the powertrain 2, reduce its size and cost, facilitate the lightweight design of the powertrain 2, and improve its power density.

[0151] In this embodiment, the components within each circumferential housing 200a are connected to the motor controller 31 from the circumferential housing 200b on the reducer 20 side. This fully utilizes the space between the circumferential housing 200b and the gear set of the reducer 20 along the radial direction R. The connection lines of the components within each circumferential housing 200a do not need to occupy additional space along the axial direction A of the circumferential housing 200a, or the space occupied by the components within each circumferential housing 200a along the axial direction A is reduced. The components in each intermediate integrated housing 30 are arranged compactly, reducing the size of the powertrain 2 along the axial direction A, which is beneficial for the installation and arrangement of the powertrain 2 in the electric vehicle 1.

[0152] On the other hand, since the connecting wires of the devices in each circumferential housing 200a pass through the outlet hole 120 of the partition 100 and are connected to the motor controller 31 in the circumferential housing 200b, the connecting wires are concentrated in the middle position along the axial direction A of the powertrain 2, which reduces the risk of the connecting wires being bumped or scratched, and improves the reliability of the connection between the connecting wires and the devices and motor controller 31 in the circumferential housing 200a.

[0153] Please see Figure 3 and Figure 9 In one embodiment, the powertrain 2 further includes a motor controller housing, which includes a control signal connector mounting hole 35 and a high-voltage DC connector mounting hole 36. The control signal connector mounting hole 35 is used to fix a control signal connector, which transmits control signals to the motor controller 31. The high-voltage DC connector mounting hole 36 is used to fix a high-voltage DC connector, which receives power from the power battery. The control signal connector mounting hole 35 and the high-voltage DC connector mounting hole 36 are arranged opposite to each other along an axial direction A perpendicular to the powertrain 2. Along the direction in which the control signal connector mounting hole 35 and the high-voltage DC connector mounting hole 36 are arranged opposite to each other, the control signal connector mounting hole 35 and the high-voltage DC connector mounting hole 36 respectively penetrate the motor controller 31 housing.

[0154] In this embodiment, the control signal connector mounting hole 35 and the high-voltage DC connector mounting hole 36 are arranged on both sides along the direction perpendicular to the axial direction A, which helps to reduce the size of the powertrain 2.

[0155] In one embodiment, at least one through hole in the other circumferential housing 200 of each intermediate integrated housing 30 is used to connect the inner cavity of the motor controller 31 housing and the inner cavity of the other circumferential housing 200. Along the axial direction A of the powertrain 2, at least one through hole in the other circumferential housing 200 of one intermediate integrated housing 30 and at least one through hole in the other circumferential housing 200 of the other intermediate integrated housing 30 are respectively arranged on both sides of the partition plate 33.

[0156] In this embodiment, in each intermediate integrated housing 30, at least one through hole is located closer to the partition 100, which helps to reduce the length of the resolver connection line and the winding connection line, and improves the regularity of the wiring layout in the powertrain 2.

[0157] Please see Figure 10 In one embodiment, the powertrain 2 includes two end plates 34, and the motor controller 31 housing includes two side panels 32. The two side panels 32 are arranged opposite each other along the axial direction A of the powertrain 2, and the two end plates 34 are arranged opposite each other along the axial direction A of the powertrain. The distance between the two side panels 32 along the axial direction A of the powertrain is less than the distance between the two end plates 34. One end plate 34 is used to fixably connect a circumferential housing 200 of an intermediate integrated housing 30 to form a motor receiving cavity, which is used to receive a motor 10. The other end plate 34 is used to fixably connect a circumferential housing 200 of another intermediate integrated housing 30 to form another motor receiving cavity, which is used to receive another motor 10.

[0158] The circumferential housing 200 refers to the circumferential housing 200a that houses the motor stator 13.

[0159] In this embodiment, by rearranging the winding connection lines, resolver connection lines, resolver sensor 40, etc., the arrangement of the components in the powertrain 2 is more compact and orderly. The distance between the two sides 32 along the axial direction A is smaller than the distance between the two end plates 34, which allows for a reduction in the housing size of the motor controller 31, thus facilitating the miniaturization of the powertrain 2.

[0160] Please see Figure 10 In one embodiment, the housing of the motor controller 31 further includes at least two coolant ports 230, each including an inlet and an outlet. The inlet is used to supply coolant to the motor controller 31 to cool it. The outlet is used to discharge coolant. The at least two coolant ports 230 are arranged at intervals from at least one through hole. The powertrain with reducer-side wiring, the integrated dual-motor powertrain, and the electric vehicle provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and embodiments of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the technical solutions of this application. Furthermore, for those skilled in the art, based on the ideas of this application, there will be changes in specific embodiments and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A powertrain integrating dual motors, characterized in that, The powertrain includes two motors, two reducers, two intermediate integrated housings, and a central partition. Each intermediate integrated housing includes an integrally die-cast partition and two circumferential housings, wherein: The two circumferential housings of each intermediate integrated housing are arranged along the powertrain axis, one circumferential housing is used to fix the motor stator of one of the motors and to house the motor rotor of one of the motors, and the other circumferential housing is used to house the gear set of one of the reducers; The central partition includes two mounting surfaces along the axial direction of the powertrain, each mounting surface being used to securely connect one of the intermediate integrated housings to another of the circumferential housings; Each of the intermediate integrated housings has a partition plate comprising a shaft hole, at least one cable outlet hole, and two opposite end faces along the powertrain axis, wherein the shaft hole and the at least one cable outlet hole are used to connect the cavities of the two circumferential housings in the same intermediate integrated housing.

2. The powertrain according to claim 1, characterized in that, The partition plate includes grooves on two end faces along the powertrain axis. The inner cavity of one groove on each end face communicates with the inner cavity of one of the circumferential housings to form a reducer receiving cavity for accommodating a gear set of the reducer.

3. The powertrain according to claim 1, characterized in that, Each of the intermediate integrated housings includes at least one through-hole extending through the other circumferential housing.

4. The powertrain according to claim 3, characterized in that, The powertrain also includes a motor controller housing, wherein at least one through-hole in the other circumferential housing of each intermediate integrated housing communicates the inner cavity of the motor controller housing and the inner cavity of the other circumferential housing, wherein: Along the axial direction of the powertrain, at least one through hole in one intermediate integrated housing and at least one through hole in another circumferential housing are respectively arranged on both sides of the partition plate.

5. The powertrain according to claim 3, characterized in that, The powertrain includes a motor controller, and the connecting wires of the components in the one circumferential housing are connected to the motor controller from the inner cavity of the one circumferential housing, through the outlet hole, the inner cavity of the other circumferential housing, and the at least one through hole in sequence.

6. The powertrain according to claim 3, characterized in that, The at least one through hole includes a first through hole, the distance between the first through hole and the shaft hole being greater than or equal to the radius of the circumferential housing.

7. The powertrain according to claim 6, characterized in that, The powertrain includes a motor controller, a portion of the motor controller housing is integrated into a circumferential housing, the motor controller housing and the circumferential housing share a common housing, and the first through hole is formed in the common housing between the motor controller housing and the circumferential housing.

8. The powertrain according to claim 7, characterized in that, The at least one through hole also includes a second through hole, and both the first through hole and the second through hole are formed in the common housing between the housing of the motor controller and the circumferential housing.

9. The powertrain according to any one of claims 3-8, characterized in that, The at least one through hole includes a first through hole and a second through hole, wherein the first through hole and the second through hole are spaced apart along the circumferential and axial directions of the powertrain, wherein: Along the powertrain axis, the distance between the second through hole and the partition is less than the distance between the first through hole and the partition; Along the radial direction of the powertrain, the distance between the second through hole and the shaft hole is greater than or equal to the distance between the first through hole and the shaft hole.

10. The powertrain according to any one of claims 1-9, characterized in that, The distance between the center point of the at least one outlet hole and the center point of the shaft hole along the radial direction of the powertrain is less than the outer diameter of the stator of the motor.

11. The powertrain according to any one of claims 1-10, characterized in that, The powertrain also includes two resolver sensors, each of the shaft holes being coaxially arranged with the input shaft of one of the reducers or the motor shaft of one of the motors, and the distance between the at least one outlet hole and the center point of the shaft hole being greater than the inner diameter of the resolver stator of the resolver sensor.

12. The powertrain according to claim 11, characterized in that, One of the two end faces facing the motor stator of the motor is used to fix the resolver stator of the resolver sensor. The resolver rotor of the resolver sensor is used to drive the motor shaft of the motor or the input shaft of the reducer. The at least one wire outlet includes a first wire outlet, which is used to pass through the resolver connection wire between the resolver sensor and the motor controller.

13. The powertrain according to claim 12, characterized in that, The distance between the first cable outlet hole and the shaft hole along the radial direction of the powertrain is less than the inner diameter of the motor stator of the motor, and the hole area of ​​the first cable outlet hole is less than the hole area of ​​the shaft hole.

14. The powertrain according to any one of claims 1-13, characterized in that, The lead-out end of the motor winding of the motor faces the end face, and the at least one lead-out hole includes a second lead-out hole for passing through the motor winding of the motor and the winding connection wire of the motor controller.

15. The powertrain according to claim 14, characterized in that, The second outlet hole is located on the periphery of the input shaft bearing cavity, away from the output shaft bearing cavity.

16. The powertrain according to claim 14, characterized in that, The width of the second cable outlet along the circumferential direction of the powertrain is greater than the width of the second cable outlet along the radial direction of the powertrain.

17. The powertrain according to any one of claims 1-16, characterized in that, The at least one cable outlet includes a first cable outlet and a second cable outlet. The second cable outlet and the first cable outlet are arranged at intervals along the circumference of the powertrain. The distance between the second cable outlet and the shaft hole along the radial direction of the powertrain is greater than or equal to the distance between the first cable outlet and the shaft hole. The hole area of ​​the second cable outlet is greater than or equal to the hole area of ​​the first cable outlet.

18. The powertrain according to any one of claims 1-16, characterized in that, The powertrain includes a motor controller, and the at least one cable outlet includes a first cable outlet and a second cable outlet. The distance between the first cable outlet and the housing of the motor controller is greater than the distance between the second cable outlet and the housing of the motor controller.

19. The powertrain according to any one of claims 14-16, characterized in that, The other end face of the two end faces that is away from the motor stator includes an input shaft bearing cavity, which is used to fix the outer ring of the input shaft bearing. The input shaft bearing cavity and the second outlet hole are arranged radially along the powertrain. The distance between the second outlet hole and the center of the shaft hole is greater than the outer diameter of the input shaft bearing cavity. Along the axial direction of the powertrain, the projection of the second outlet hole does not overlap with the projection of the input shaft bearing cavity.

20. The powertrain according to any one of claims 14-16, characterized in that, The projection of the second outlet hole along the powertrain axis at least partially overlaps with the projection of the motor winding along the powertrain axis.

21. The powertrain according to any one of claims 1-20, characterized in that, The other end face, which is away from the motor stator, includes an input shaft bearing cavity, an intermediate shaft bearing cavity, and an output shaft bearing cavity, wherein: The input shaft bearing cavity is used to fix the outer ring of the input shaft bearing, and the inner ring of the input shaft bearing is used to drive the input shaft of the reducer. The shaft hole and the input shaft bearing cavity are arranged coaxially. The intermediate shaft bearing cavity is used to fix the outer ring of the intermediate shaft bearing, and the inner ring of the intermediate shaft bearing is used to drive the intermediate shaft of the reducer. The output shaft bearing cavity is used to fix the outer ring of the output shaft bearing, and the inner ring of the output shaft bearing is used to drive the output shaft of the reducer. The distance between the output shaft bearing cavity and the shaft hole is greater than the distance between the intermediate shaft bearing cavity and the shaft hole, and the distance between the at least one outlet hole and the input shaft bearing cavity is less than the distance between the at least one outlet hole and the output shaft bearing cavity.

22. The powertrain according to any one of claims 1-21, characterized in that, The powertrain includes two end plates, and the motor controller housing includes two sides. The two sides are arranged opposite each other along the axial direction of the powertrain. The two end plates are also arranged opposite each other along the axial direction of the powertrain. The distance between the two sides along the axial direction of the powertrain is less than the distance between the two end plates. One of the end plates is used to fixally connect the circumferential housing of the one intermediate integrated housing to form a motor receiving cavity, the motor receiving cavity being used to receive one of the motors; the other end plate is used to fixally connect the circumferential housing of the other intermediate integrated housing to form another motor receiving cavity, the other motor receiving cavity being used to receive another motor.

23. The powertrain according to any one of claims 1-22, characterized in that, The powertrain also includes a motor controller housing, which includes a control signal connector mounting hole and a high-voltage DC connector mounting hole. The control signal connector mounting hole is used to fix the control signal connector, which is used to transmit control signals to the motor controller. The high-voltage DC connector mounting hole is used to fix the high-voltage DC connector, which is used to receive power from the power battery. The control signal connector mounting holes and the high voltage DC connector mounting holes are arranged opposite each other along an axis perpendicular to the powertrain. Along the direction in which the control signal connector mounting holes and the high voltage DC connector mounting holes are arranged opposite to each other, the control signal connector mounting holes and the high voltage DC connector mounting holes respectively penetrate the motor controller housing.

24. A powertrain with a reducer-side output cable, characterized in that, The powertrain includes an intermediate integrated housing, a resolver sensor, a motor, and a reducer. The motor receives drive from a motor controller to drive the reducer. The intermediate integrated housing includes a die-cast partition and two circumferential housings, wherein: The two circumferential housings are arranged along the axial direction of the powertrain. One circumferential housing is used to fix the stator of the motor and to house the rotor of the motor. The other circumferential housing is used to house the gear set of the reducer. The other circumferential housing includes at least one through hole that penetrates the other circumferential housing. The partition is used to separate the inner cavities of the two circumferential housings. The partition includes a shaft hole, at least one outlet hole, and two end faces opposite each other along the axial direction of the powertrain. The shaft hole and the at least one outlet hole are used to connect the inner cavities of the two circumferential housings. The shaft hole is coaxially arranged with the input shaft of the reducer or the motor shaft of the motor. The distance between the at least one outlet hole and the center point of the shaft hole is greater than the inner diameter of the resolver stator of the resolver sensor. The at least one cable outlet includes a second cable outlet, which is used to pass through the motor winding of the motor and the winding connection wire of the motor controller. The distance between the second outlet hole and the shaft hole along the radial direction of the powertrain is less than the inner diameter of the motor stator of the motor.

25. An electric vehicle, characterized in that, The electric vehicle includes wheels, a battery pack, and a powertrain as described in any one of claims 1-24, the powertrain being used to receive power from the battery and drive the wheels.

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